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/* We cannot use timestamp in MySQL because of the implicit TimeZone conversions it does behind the scenes */
DROP DOMAIN IF EXISTS datetime CASCADE;
CREATE DOMAIN datetime AS timestamp without time zone;
/* TEXT in MySQL is smaller then MEDIUMTEXT */
DROP DOMAIN IF EXISTS mediumtext CASCADE;
CREATE DOMAIN mediumtext AS text;
/* PostgreSQL uses BYTEA to manage all BLOB types */
DROP DOMAIN IF EXISTS mediumblob CASCADE;
CREATE DOMAIN mediumblob AS bytea;
CREATE OR REPLACE LANGUAGE plpgsql;
CREATE OR REPLACE FUNCTION last_insert_id() RETURNS BIGINT AS $$
DECLARE
result BIGINT;
BEGIN
SELECT lastval() INTO result;
RETURN result;
EXCEPTION WHEN OTHERS THEN
SELECT NULL INTO result;
RETURN result;
END;
$$ LANGUAGE plpgsql VOLATILE;
CREATE OR REPLACE FUNCTION schema() RETURNS VARCHAR AS $$
DECLARE
result VARCHAR;
BEGIN
SELECT current_schema() INTO result;
RETURN result;
EXCEPTION WHEN OTHERS THEN
SELECT NULL INTO result;
RETURN result;
END;
$$ LANGUAGE plpgsql IMMUTABLE;
CREATE OR REPLACE FUNCTION hour(ts TIMESTAMP WITH TIME ZONE) RETURNS INTEGER AS $$
DECLARE
result INTEGER;
BEGIN
SELECT EXTRACT(HOUR FROM ts) INTO result;
RETURN result;
EXCEPTION WHEN OTHERS THEN
SELECT NULL INTO result;
RETURN result;
END;
$$ LANGUAGE plpgsql IMMUTABLE;
/* Alter 'serial' columns to 'bigint' because 'serial' is 32bit in PG while 64bit in MySQL */
CREATE OR REPLACE FUNCTION update_serial_to_bigint_oncreate()
RETURNS event_trigger LANGUAGE plpgsql AS $$
DECLARE
r record;
matches text[];
BEGIN
FOR r IN SELECT * FROM pg_event_trigger_ddl_commands()
LOOP
SELECT regexp_matches(current_query(), E'\\m(\\w+)\\s+serial\\M') INTO matches;
IF r.object_type = 'table' AND array_length(matches, 1) > 0 THEN
RAISE NOTICE 'Altering % % column % from serial to bigint',
r.object_type,
r.object_identity,
matches[1];
EXECUTE 'ALTER TABLE ' || r.object_identity || ' ALTER COLUMN ' || matches[1] || ' TYPE bigint';
END IF;
END LOOP;
END
$$;
CREATE EVENT TRIGGER update_serial_to_bigint_oncreate
ON ddl_command_end WHEN TAG IN ('CREATE TABLE')
EXECUTE PROCEDURE update_serial_to_bigint_oncreate();
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